File indexing completed on 2024-05-19 04:39:20

 /*
     SPDX-FileCopyrightText: 2012 Olivier de Gaalon <olivier.jg@gmail.com>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #ifndef KDEVPLATFORM_KDEVHASH_H
 #define KDEVPLATFORM_KDEVHASH_H
 
 #include <QHash>
 
 /**
  * A helper class to implement hashing for aggregate types.
  *
  * @code
  * class MyType {
  *     ...
  *     uint hash() const
  *     {
  *         KDevHash hash;
  *         return hash << m_1 << m_2 << ...;
  *     }
  * };
  * @endcode
  */
 class KDevHash
 {
 public:
     enum {
         DEFAULT_SEED = 2166136261u
     };
 
     explicit KDevHash(uint hash = DEFAULT_SEED)
         : m_hash(hash)
     {}
 
     KDevHash(const KDevHash&) = delete;
     KDevHash& operator=(const KDevHash&) = delete;
 
     inline operator uint() const
     {
         return m_hash;
     }
 
     template <typename T>
     inline KDevHash& operator<<(T value)
     {
         m_hash = hash_combine(m_hash, qHash(value));
         return *this;
     }
 
     static inline uint hash_combine(uint seed, uint hash)
     {
         // this is copied from boost::hash_combine
         return seed ^ (hash + 0x9e3779b9 + (seed << 6) + (seed >> 2));
     }
 
 private:
     uint m_hash;
 };
 
 #endif //KDEVPLATFORM_KDEVHASH_H